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Share Capital - Additional Information (Detail) - CAD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 13, 2018 | Nov. 11, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of classes of share capital [abstract] |  |  |  |
Description on par value of share |  |  | Common shares, with no par value |
Repurchase of common shares | 2,278,747 | 2,273,879 |  |
Shares Repurchased for cancellation |  |  | 2,470,560 | 465,713
Shares repurchased for cancellation |  |  | $ 76.7 | $ 14.4
Reduction in share capital |  |  | 19.1 | 3.6
Reduction in share capital and contributed surplus accounts |  |  | 0.5 | 0.0
Charges to retained earnings |  |  | 57.1 | 10.8
Share-based compensation expense |  |  | 5.3 | 9.5
Expense related to fair value of options granted |  |  | 5.6 | 4.9
Expense related to amortization of fair value of options granted |  |  | 0.3 | 4.6
Dividends declared included in trade and other payables |  |  | $ 15.4 | $ 14.3

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- Definition The amount of treasury stock cancelled during the period. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The explanation of the fact that shares have no par value. [Refer: Par value per share] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease in equity resulting from a reduction in issued capital. [Refer: Issued capital] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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